As recognized by United Nations Secretary General Kofi Annan, the human community has reached a point in which it is faced with an array of choices that will determine the quality of our lives and the state of the global environment for present and future generations. One possibility is that at long last we will pave a path toward environmental stewardship and sustainable development. But it is also quite possible that we will travel a less enlightened course, running down the earth's natural capital and severely limiting the choices our descendants will face.